前端js实现把网页导出为pdf

前段时间遇到一个需求，产品说需要把当前页面，点击导出按钮，导出为pdf，所以就有了以下代码：
部分来自于官方直连GPT4o

import $ from "jquery";
import html2canvas from 'html2canvas';
import jsPDF from 'jspdf'

export default {
    data () {
        return {}
    },
    mounted() {
        
    },
    methods: {
        formatterPdfElement($dom) {
            var $copyElement = $dom.cloneNode(true);
            document.querySelector('.export-preview-container').appendChild($copyElement);
            this.visiblePreview = true;
            this.$nextTick(() => {
                var results = [{
                    position: 0,
                    height: 0
                }];
                var pageOffsetTop = $copyElement.offsetTop;
                var pageOffsetWidth = $copyElement.offsetWidth;
                // var $unitElements = $($copyElement).find('.minimum-unit'); // 遍历所有子元素不可取，应只遍历第一层子元素
                var $unitElements = $($copyElement).children(); // 遍历所有子元素不可取，应只遍历第一层子元素
                var perPageHeight = pageOffsetWidth / 595.28 * 841.89;
                let tHeight = perPageHeight;
                let insertList = [];
                $unitElements.each((index, $element) => {
                    console.log(tHeight, 'tHeight');
                    console.log($($element), $($element).outerHeight(true));
                    tHeight -= $($element).outerHeight(true);
                    if (tHeight < 0) {
                        let remainHeight = parseInt(tHeight + $($element).outerHeight(true) + 30);
                        tHeight = perPageHeight - $($element).outerHeight(true);
                        let obj = {index, remainHeight};
                        insertList.push(obj);
                    }
                });
                insertList.forEach((dif, index) => {
                    let remHeight = dif.remainHeight;
                    let domObj = document.createElement("div");
                    domObj.innerHTML = "";
                    domObj.setAttribute("style", `width:100%;height:${remHeight}px`)
                    console.log('$unitElements[dif.index] :>> ', $unitElements[dif.index]);
                    $unitElements[dif.index].before(domObj);
                })
                console.log($copyElement, "241");
                // return

                var pdf = new jsPDF('', 'pt', 'a4');
                html2canvas($copyElement, {
                    useCORS: true,
                    scale: 2,
                    allowTaint: true,
                    background: '#f0f4f7',
                    ignoreElements: (element) => {
                        if (element.className.indexOf('top-btns') > -1) {
                            return true;
                        }
                        return false;
                    }
                }).then(canvas => {
                    var contentWidth = canvas.width;
                    var contentHeight = canvas.height;
                    var pageHeight = contentWidth / 592.28 * 841.89;
                    var leftHeight = contentHeight;
                    var position = 0;
                    var imgWidth = 592.28;
                    var imgHeight = 592.28 / contentWidth * contentHeight;
                    if (leftHeight < pageHeight) {
                        pdf.addImage(canvas.toDataURL('image/jpeg', 1), 'JPEG', 0, position, imgWidth, imgHeight)
                    } else {
                        while (leftHeight > 0) {
                            pdf.addImage(canvas.toDataURL('image/jpeg', 1), 'JPEG', 0, position, imgWidth, imgHeight);
                            leftHeight -= pageHeight;
                            position -= 841.89;
                            if (leftHeight > 0) {
                                pdf.addPage();
                            }
                        }
                    }
                }).then(() => {
                    const name = `${this.reportInfo.devPath}-${this.reportInfo.startDtm}~${this.reportInfo.endDtm}`;
                    pdf.internal.scaleFactor = 1.33;
                    pdf.save(`${name}.pdf`);
                    this.isExporting = false;
                    this.visiblePreview = false;
                });
            })
        },
        exportReport() {
            var content = document.querySelector('.mian-box-contain');
            this.formatterPdfElement(content);
        },
        /*
        *  导出pdf函数
        **/
        exportReportPdf() {
            window.open(this.newUrl)
        }
    },
}